Why are CRYSTAL® ENERGY STAR® WINDOWS better than standard air filled windows?
The National Fenestration Council (NFRC) rates the performance of windows on how well they keep your home cool in the
summer, and warm in the winter, keep out wind, and resist condensation.

U-Factor: Measures how well a product prevents heat from escaping. The lower the U-Value, the greater insulating performance.R-Value: Measures insulating value of window, and is the inverse of the U-Value.VT Visual Transmittance: Measures how much light comes through a window. High VT allows for greater SHGC solar heat gain.SHGC Solar Heat Gain Coefficient: Measures how well a window blocks heat caused by sunlight. The lower SHGC value, less solar heat transmitted.*

CRYSTAL® ENERGY STAR® CONSUMER TIP*:

For Spring & Summer:
Casement: By adding full screen, you can reduce SHGC by 50%.
Double Hung: By adding full screen, you can reduce SHGC by 50%
Double Hung: By adding half screen, you can reduce SHGC by 25%
Reducing SHGC will reduce your HVAC cooling energy bills!